Agilent Technologies 20ET ユーザーズマニュアル
3-30
Making Time Domain Measurements
Range
Range
In the time domain, range is defined as the length in time that a measurement can be
made without encountering a repetition of the response, called aliasing. A time domain
response repeats at regular intervals because the frequency domain data is taken at
discrete frequency points, rather than continuously over the frequency band.
made without encountering a repetition of the response, called aliasing. A time domain
response repeats at regular intervals because the frequency domain data is taken at
discrete frequency points, rather than continuously over the frequency band.
where
∆
F is the spacing between frequency data points
For example:
Measurement range
1
∆
F
-------
=
Measurement range
number of points
1
–
(
)
frequency span Hz
(
)
--------------------------------------------------------------
=
Measurement
201 points
=
Frequency Span = 1 GHz to 3 GHz
Frequency Spacing
∆
F
(
)
10 MHz
=
Range
1
∆
F
------- or
number of points
1
–
(
)
frequency span
-----------------------------------------------------------------
=
Range
1
10
10
6
×
(
)
-------------------------
=
or
201
1
–
(
)
2
10
9
×
(
)
----------------------
Range
100
10
9
–
×
seconds
=
Electrical Length
range
the speed of light 3
10
8
m
s
----
×
×
=
ElectricalLength
100
10
9
–
s
×
3
10
8
m
s
----
×
×
=
ElectricalLength 30 meters
=